Tommy Thompson releases first TV ad as poll shows him strong

Thompson trails Baldwin, the likely Democratic nominee, by 46 percent to 45 percent. Baldwin leads Neumann by six points and Fitzgerald by eight points. While Thompson has led Baldwin in other polls of the race, this poll is good news for him, as his primary numbers have been closer in those polls.

Thompson's ad ignores his opponents and focuses on Obama.

"America is in trouble, and I can't sit by any longer," he says in the ad. "I'll repeal Obamacare and stop Washington from busting the budget, killing jobs, and destroying our children’s future. Let's do for America what we did for Wisconsin."

The poll of 900 voters including 556 Republican primary voters was conducted from Feb. 23-26. The general-election portion has a margin of error of 3.3 percent, while the primary's margin of error is 4.2 percent.

Watch the ad here: